Recorder



E. H. BRISTOL 1,880,755

REC ORDER Filed June 13, 1927 Juventa* ldyar [1.1i 721920Z,

v thereof wi11 be promoted.

` chart is the pen arm,

Patented ocr. 4. i932 I .o UNITED lSTATES PATENT oFFlcE -IEDGAB E.BRISTOL, OF OIBOR0, CHUSETTS, ASSIGNOB T0 THE FOXBO() COH- K -PANYQ OIFFOXBORO, IASSLCB'USETTS,

.A GOBCPOBATION' 0F MASSACHUSETTS A BECDBDER Y appliance mea :ne 1s,

This invention relates to recording instru-Y ments and the object is toprovide various 'improvements in means for supporting the pen wherebythe instrument will be more convenient in use and accurate functioningVMy vention will be well understood by reference to the followingdescription of the illustrative embodiment thereof shown by way ofexampleY inthe accompanying drawing, wherein:

Fig.V 1 ,is a front elevation of a recording f instrunient `embodying myimprovements,

part of the door and glazing being broken 15 away;

Fig. .2 is an enlarged side elevation of the Alower portion of the penarm with the pen;

Fig. 3 is a section on the line 3--3 of Fig. 2; and Y Y Y- Figs. 4 and 5aresections on a still larger m scale on the lines and 5-5 of Fig. 1

respectively.

Referring to Fig. 1 of the drawing, l have there shown a recor ginshument 'Z of known type-having the' polar chart 9 adapted tofberevolved by the spindle 11 of a clock movement. acrossthe face of thisesignated in Fig. 1 as a Whole by 'the numeral 13, moving about a fixedcenter 15 at the edge of the chart. The construction illustrated by wayof example embodies features which are fully described Pin my Patent No.1,290,890, Jan. 14, 1919.

' In the arrangement shown the pen is of the depending type and center15 is near the `upper edge of the case. The body of theY s pen arm ma asbest shown by Figs. 2 to 5, comprise a at strip of metal of such widthas to be substantially inllexible laterally, that o is, in a planeparallel to that of the chart, and

the arm 1s Vadapted normally yieldingly to pres the pen 'against thechart to record thereon. The pen arm may be flexed in a directionperpendicular .to the chart when '45 it isv desired to lift the pentherefrom. For

' instance, the pen may be lifted off the chart by means of a pen lifter17, the one here shown being like that described in said Patent No.1,290,890 referred to. To prevent the pen arm from becoming 1927. SerialNo. 198,315.

lbent or crumpled through continued use,

which might alter the length thereof so thaty it would not accuratel pollow the desired arc of the chart and which also would render itunsightly, itis preferably arranged to flex only in a relatively shortzone remote from the pen and adjacent the center 15 and for this purposethe strip may be left flat for a relatively' short distance at 19 whilethe major length of the body of the pen arm is substantially rigid.Herein this rigidity is elected by providing the remainder of the lengththereof with a stifening corrugation 21 (see Figs.A 4 and 5). Theflexibility 4of the pen arm is thus localized and distortion of the sameis prevented.

The pen 23 is generally of channel form and may comprise the capillarychannel 25 Y bevelled to provide a unitary point and having wingVportions 27 rising from the flanges of the channel and providing anink-receiving reservoir. The construction of pen illustrated is morefully disclosed in the patent to E. el'. Watts, No. 1,447,582, March 6,1923. The channel of the pen faces upwardly, the penarm being of thedepending t e which,

hanging down over the. face of the c art, susl pends the pen in markingposition. To effect this the pen may be received in a channel-shapedholder 29 which provides an un'- derriding support therefor and fwhichis connected laterally of the pento the main body of the pen armsso thatthe channel of the pen is unobstructed from above. Herein I have shownthe holder 29 as secured in the ,bight of a long wire loop 31, the upperend of Y .which is soldered to the strip which forms the body of the penarm. The pen arm considered' as a whole is thus open centrali adj acentits lower end for a considerable d1stance between the legs of the wireloop 31 and the channel of the pen faces and opens to this space.

In the use of an instrument of this the pen must be cleaned from time totime and in accordance with the construction shown the channel isunobstructed for a substantial distance above the pen. Thus', a piece ofblotting paper may be thrust through the central opening at the bottomof thepen arm between the legs of the loop 31 so that it may wipethrough the channel of the pen, which is open at the back, from end toend quickly and thoroughly to clean the same. The arrangement alsofacilitates filling the pen with ink `without danger of getting any onthe pen arm.

The. lower portion of thel pen arm being substantially rigid by virtueof the corrugation 21 when the pen arm is flexed at-19 to raise the penfrom the chart, the rigid portion finds a support on the arm of the penlifter'l and a comparatively firm resistance is offered whichfacilitates cleaning in the manner described.

I have described in detail the particular embodiment of my inventionshown by way of example inthe accompanying drawing. It is obvious thatthe construction may be widely varied while obtaining some or all of theadvantagesmcontemplated by the invention. The explicit nature of thedescription therefore, is not to be taken as a definition ofA the scopeof the invention but is to be understood merely as an explanation of theparticular embodiment thereof shown in the draw- 1n by Letters Patent Ishall express inthe following claims.

1. In a recording instrument a. depending g. e What I claim as new anddesire to securey vidin an unobstructed space above the channel o thepen for a substantial distance whereby ready access of a cleaninginstrument to pass the edge of such longitudinally pen arm, a channeledpen having an open ck, a channeled holder receiving the pen, said armsuspendin said holder by connection to a side thereo leaving the spaceabove the channel of the pen unobstructedfor a substantial distanceabove the same to provide for ready access of a cleaning instrumentJ topass the edge of such through the pen.

2. In a recording instrument a n arm hanging down .over the chart andplvoted to swing substantially in a plane parallel thereto, the bodythereof comprising a generally flat strip substantially inflexible in aplane parallel to the chart and normally adapted iylfieldingly to pressagainst the chart a pen eld thereby, a channeled pen, an underridingsupport for the pen having a connection lateral of the pen to the bodyof the arm and providing an unobstructed space above the channel of thepen for a substantial distance -whereby ready access of a cleaninginstrument to passthe edge of such through the pen is provided for.

3. In a recording instrument a depending penarm pivoted to move over thechart and having adjacent said pivot and remote from the pe'n arelatively short zone of flexure in a direction perpendicular to thechart, means engaging the pen ,arm below said zone to praise and supportthe pen'away from the chart, a channeled pen,

l an'underriding support for the pen having a connectionlateraloftlaiegpen to the body of the arm 'and pro-

